Question

desean is sorting his rock collection. 2/3 of the rocs are metamorphic, and 3/4 of the remainder are igneous rocks. If the 3 rocks left over are sedimentary, how many roks does Desean have?

Answer 1

2/3 of rocks are metamorphic
3/4 of the remainder are igneous rocks
3 rocks left over are sedimentary

The rocks that Desean has are
2/3 + 3/4 + 3 = 4 x 2 + 3 x 3/4 + 3 =17 + 36/12 = 20
So Desean had 20 rocks
Hope this helps